Need advice on selling mobile apps

So I have a few ways that I can make custom apps very fast. It generally takes about 20 minutes from start to finish. So I want to get restaurant clients using this technique. Im having trouble figuring out what method I should use to sell it to them. My goal is to get a $50 / month retention fee for access to the app and having me maintain it. I would also like to charge an upfront fee, but thats up for debate.

So my issue is that I dont want to come off too salesy. I have never had good luck trying to be a salesman. Its just not who I am and it doesnt work for me haha. So I have a few ideas but I was hoping you all could help me generate more ideas or offer me some advice

Heres the things I can think of.

Email: Send and email highlighting the app, statistics on apps and things of that sort
The problem that I feel with this is that the conversion rates would be wayyyy too low and probably wouldnt be worth the effort

Phone: Call them and tell them that I make apps and what not.
This seems to salesy to me. I think they would just hang up or say they are not interested and again convert very very low.

Walk in: Walk in and try to talk to them
I just dont think this would even work.

Hey man you have to start someone, regardless if you think people won't buy or end up hanging up the phone on you. You're going to have to get over the too salesy part, have the proper mindset going into the situation. fact is a sale is made on every phone call, walk in, or other forms of communication. Either you sell the person what you have to offer, or they sell you on an excuse why they can't buy. Who's going to close, you or them?

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